@sierragb - One other thing I discovered that you could try. In the Options for the decision tree, under Model Display, change the layout to Stack.
This will place the 4 visuals into a stack container, which shows them each individually rather than all in one shot. If you do this and then select Save Image, it will show only the decision tree (or whichever visual you have displayed in the stack at the time).
Note that it will include the labels/tabs for switching between the visuals in the stack, but it still only focuses on one object at a time.
Example:
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